The nearest star to our solar system is 4.29 light years away. How mcuh is this distance in terms of par sec ? How mcuh parallax would this star show when viewed from two locations of the earth six months apart in its orbit around the sun?

A star is located 9 ly away from us. What is its distance in par sec ? What is the parallax shown by this star when viewed from two locations 3xx10^(11)m apart. Given 1 par sec =3.084xx10^(16)m, and 1ly = 9.46xx10^(15)m.

The principle of 'parallax' in Art. 1(c ).4. is used in the determination of distacne of very distant stars. The baseline AB in the line joining the Earth's two locations six months apart in its orbit around the sun. That is, the baseline is about the diameter of the Earth 's orbit ~~3xx10^(11)m. However, even the nearest stars are so distnat thet with such a long baseline, they show parallax only of the order of 1''(second) of arc or so . A parsec is a convenient unit of length on the astronomical scale. It is the distance of an objhect that will shown a parallax of 1'' (second) of arc fome oppsoite ends of a beasline equal to the distance from the Earth to the sun. How much is a parsec in terms of metres ?

Let a star be much brighter than our sun but its mass is same as that of sun If our earth has average lift span of man as 70 years In the earth like planet of this star system having double the distance from our star find the average lift span of a man on this planet in terms of our year .

A trinary star system which is a system of three orbiting around centre of mass of system has time peroid of 3 years, while the distance between any two stars of the system is 2 astronomical unit. All the three stars are identical and mass of the sun is M and total mass of this multiple star system is (a)/(b)xxM . Then find (b)/(3) ? (a and b are lowest possible integers (I astronomical unit is equal to distance between sun and earth, time period of rotation of earth around sun is 1year)